The "Original" Saltwater Leader is tested and proven under some of the toughest Worldwide conditions.The "Original" in a user friendly wrist spool that is self dispensing. Easy to use when rocking & rolling on the boat! Made of German high quality Perlon monofilament material. The Perlon difference: Unlike nylon, which is weakened by being stretched, Perlon mono restores itself to near full strength 400-500 times in cycle tests.